allow to compile/run 64bit version of VR lib, workaround for issue that both 32bit and 64bit version is called openvr_api.dll

Now 64bit version is called openvr64pi.dll (patched the 64bit binary library openvr_api.lib)
See also https://github.com/ValveSoftware/openvr/issues/412

build_visual_studio_vr_pybullet_double.bat

@@ -1,8 +1,9 @@
 IF NOT EXIST bin mkdir bin
 IF NOT EXIST bin\openvr_api.dll  copy examples\ThirdPartyLibs\openvr\bin\win32\openvr_api.dll bin
+IF NOT EXIST bin\openvr64pi.dll  copy examples\ThirdPartyLibs\openvr\bin\win64\openvr_api.dll bin\openvr64pi.dll
+
+#aargh, see https://github.com/ValveSoftware/openvr/issues/412
 
-#optionally, hardcode the python path or
-#SET myvar=c:\python-3.5.3
 
 #find a python version (hopefully just 1) and use this
 dir c:\python* /b /ad > tmp1234.txt

examples/SharedMemory/premake4.lua

@@ -318,7 +318,11 @@ if os.is("Windows") then
 					"../ThirdPartyLibs/openvr/samples/shared/Vectors.h",
 	}
 	if os.is("Windows") then 
+		configuration {"x32"}
 			libdirs {"../ThirdPartyLibs/openvr/lib/win32"}
+		configuration {"x64"}
+			libdirs {"../ThirdPartyLibs/openvr/lib/win64"}
+		configuration{}
 	end
 	
 	if os.is("Linux") then initX11() end